Another thing to consider, is that the still as shown can also be a representation of the Kabbalistic tree of life. Consider, when this card is in a wider spread, where the individual vessels are positioned and which adjacent cards they touch. Place deliberately designed many of his cards to be positional. This opens up many many possibilities for reading interpretation within the spread, giving this card a function beyond its intrinsic meaning of connectedness.

I don't know if this was intended by Place, but this has led me to further study of the card and how I read it.